However, if you're not in a rush, this card isn't likely to soar in price, so you could always wait and see when the opportunity arises
Teyo works in more archetypes that the blue one, Vronos, since it's good in planeswalker decks with it's +1, and most other decks with it's -2, but Teyo is good in planeswalker decks too since he makes a free flyer to block attacks as well as Defenders, Toughness, Group Hug with his +1, Pillow Fort with the -2 to force attacks elsewhere save for one, Politics decks, and any white deck that wants pure card draw
Promo cards are often some of the most likely choices for cards that might not wow you with their visual appeal, but actually boast high price tags due to their rarity or exclusivity
If you struggle to explain why one type would be super effective against another, you might be misremembering, so consult a reliable Pokmon type chart
Alas, poor Bonsly